I have been contributing to the German and English Wikipedia since 2003, and also occasionally to other projects like Commons, Wikidata or de:wikisource.

I edit the monthly Wikimedia Research Newsletter (also published as a section of The Signpost on English Wikipedia), and am one of the curators of the associated .

Other material about Wikipedia and related topics:

• "Timeline of distributed Wikipedia proposals": A survey of the - surprisingly frequent but as yet inconsequential - proposals for some kind of distributed Wikipedia (abolishing the principle that there is only one current article version for each topic), and more specifically, proposals to apply the principles of distributed revision control (as exemplified by Git in software development) to wikis in general and Wikipedia in particular.
• "Which parts of an article are actually being read?" (slides from a talk at Wikimania 2018), see also Meta-wiki page
• "Readership metrics: Trends and stories from our global traffic data" (slides from a talk at Wikimania 2017)
• "What the Wikimedia Foundation does" (slides from a talk at Wikimania 2016)
• "Failures that made us better: A brief history of the Wikimedia Foundation as a learning organization" (slides from a talk at Wikimania 2015)
• "Editor surveys" (slides from a talk at Wikimania 2013)
• "'Stop Spamming' vs. 'Nobody Told Me' - the state and future of movement broadcasting mechanisms" (slides from a talk at Wikimania 2012)
• "Academic research about the reliability of Wikipedia" (slides from a talk at a zhwiki meetup, January 2012)
• "Lessons from Citizendium": Talk at Wikimania 2009 (abstract, slides and notes), advocating a Wikipedians' view on Citizendium not as a rival, but as a valuable testing ground for several policy changes. Examining the problems with one of them gave rise to a list of errors in Citizendium's expert-approved articles.
• "Privacy, openness, trust and transparency on Wikipedia. How the free encyclopedia project deals with sockpuppets", related talk at 26C3, 2009 ()
• "CheckUser and Editing Patterns - Balancing privacy and accountability on Wikimedia projects": Talk at Wikimania 2008 (,slides and notes)

From 2011 to 2019 I worked for the Wikimedia Foundation, most recently as a senior data analyst.

Disclaimer: I worked for or provided services to the Wikimedia Foundation, but this is my personal account. Edits, statements, or other contributions made from this account are my own, and may not reflect the views of the Foundation.